use platform-independent font for gm

tools/create_test_font.cpp

+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkPaint.h"
+#include "SkPath.h"
+#include "SkStream.h"
+#include "SkTArray.h"
+#include "SkTSort.h"
+#include "SkTypeface.h"
+#include <stdio.h>
+
+enum {
+    kEmSize = 4096
+};
+
+static void output_fixed(FILE* out, SkScalar num) {
+    SkASSERT(floor(num) == num);
+    int hex = (int) num * (65536 / kEmSize);
+    fprintf(out, "0x%08x", hex);
+}
+
+static void output_scalar(FILE* out, SkScalar num) {
+    num /= kEmSize;
+    if (num == (int) num) {
+       fprintf(out, "%d", (int) num);
+    } else {
+        SkString str;
+        str.printf("%1.6g", num);
+        int width = (int) str.size();
+        const char* cStr = str.c_str();
+        while (cStr[width - 1] == '0') {
+            --width;
+        }
+        str.resize(width);
+        fprintf(out, "%sf", str.c_str());
+    }
+}
+
+static void output_points(FILE* out, const SkPoint* pts, int count) {
+    for (int index = 0; index < count; ++index) {
+        SkASSERT(floor(pts[index].fX) == pts[index].fX);
+        output_scalar(out, pts[index].fX);
+        fprintf(out, ", ");
+        SkASSERT(floor(pts[index].fY) == pts[index].fY);
+        output_scalar(out, pts[index].fY);
+        if (index + 1 < count) {
+            fprintf(out, ", ");
+        }
+    }
+    fprintf(out, ");\n");
+}
+
+const char header[] =
+"/*\n"
+" * Copyright 2014 Google Inc.\n"
+" *\n"
+" * Use of this source code is governed by a BSD-style license that can be\n"
+" * found in the LICENSE file.\n"
+" */\n"
+"\n"
+"// this was auto-generated by TestFontCreator.cpp\n"
+"\n"
+"#include \"SkPaint.h\"\n"
+"#include \"SkPath.h\"\n"
+"#include \"SkTDArray.h\"\n"
+"\n"
+"namespace sk_tool_utils {\n"
+"\n"
+"SkPaint::FontMetrics create_font(SkTDArray<SkPath*>& pathArray,\n"
+"                                 SkTDArray<SkFixed>& widthArray) {";
+
+int tool_main(int argc, char** argv);
+int tool_main(int argc, char** argv) {
+    SkPaint paint;
+    paint.setAntiAlias(true);
+    paint.setTextAlign(SkPaint::kLeft_Align);
+    paint.setTextEncoding(SkPaint::kUTF16_TextEncoding);
+    paint.setTextSize(kEmSize);
+    SkString filename("resources/DroidSans.ttf");
+    SkAutoTUnref<SkFILEStream> stream(new SkFILEStream(filename.c_str()));
+    if (!stream->isValid()) {
+        SkDebugf("Could not find resources/Roboto-Regular.ttf.\n");
+        return 1;
+    }
+    SkTypeface* typeface = SkTypeface::CreateFromStream(stream);
+    SkSafeUnref(paint.setTypeface(typeface));
+    FILE* out = fopen("./out/sk_tool_utils_font.cpp", "w");
+    fprintf(out, "%s\n", header);
+    fprintf(out, "    SkPath* path;\n");
+    for (unsigned short index = 0x20; index < 0x7F; ++index) {
+        SkPath path;
+        paint.getTextPath((const void*) &index, 2, 0, 0, &path);
+        SkPath::RawIter iter(path);
+        uint8_t verb;
+        SkPoint pts[4];
+        fprintf(out, "    path = SkNEW(SkPath); //");
+        if (index == '\\') {
+            fprintf(out, " blackslash\n");
+        } else if (index == ' ') {
+            fprintf(out, " space\n");
+        } else {
+            fprintf(out, " %c\n", (char) index);
+        }
+        fprintf(out, "    *pathArray.append() = path;\n");
+        while ((verb = iter.next(pts)) != SkPath::kDone_Verb) {
+            switch (verb) {
+                case SkPath::kMove_Verb:
+                    fprintf(out, "    path->moveTo(");
+                    output_points(out, &pts[0], 1);
+                    continue;
+                case SkPath::kLine_Verb:
+                    fprintf(out, "    path->lineTo(");
+                    output_points(out, &pts[1], 1);
+                    break;
+                case SkPath::kQuad_Verb:
+                    fprintf(out, "    path->quadTo(");
+                    output_points(out, &pts[1], 2);
+                    break;
+                case SkPath::kCubic_Verb:
+                    fprintf(out, "    path->cubicTo(");
+                    output_points(out, &pts[1], 3);
+                    break;
+                case SkPath::kClose_Verb:
+                    fprintf(out, "    path->close();\n");
+                    break;
+                default:
+                    SkDEBUGFAIL("bad verb");
+                    return 1;
+            }
+        }
+        SkScalar width;
+        SkDEBUGCODE(int charCount =) paint.getTextWidths((const void*) &index, 2, &width);
+        SkASSERT(charCount == 1);
+        fprintf(out, "    *widthArray.append() = ");
+        output_fixed(out, width);
+        fprintf(out, ";\n\n");
+    }
+    SkPaint::FontMetrics metrics;
+    paint.getFontMetrics(&metrics);
+    fprintf(out, "    SkPaint::FontMetrics metrics = {\n");
+    fprintf(out, "        0x%08x, ", metrics.fFlags);
+    output_scalar(out, metrics.fTop); fprintf(out, ", ");
+    output_scalar(out, metrics.fAscent); fprintf(out, ", ");
+    output_scalar(out, metrics.fDescent); fprintf(out, ", ");
+    output_scalar(out, metrics.fBottom); fprintf(out, ", ");
+    output_scalar(out, metrics.fLeading); fprintf(out, ",\n        ");
+    output_scalar(out, metrics.fAvgCharWidth); fprintf(out, ", ");
+    output_scalar(out, metrics.fMaxCharWidth); fprintf(out, ", ");
+    output_scalar(out, metrics.fXMin); fprintf(out, ", ");
+    output_scalar(out, metrics.fXMax); fprintf(out, ",\n        ");
+    output_scalar(out, metrics.fXHeight); fprintf(out, ", ");
+    output_scalar(out, metrics.fCapHeight); fprintf(out, ", ");
+    output_scalar(out, metrics.fUnderlineThickness); fprintf(out, ", ");
+    output_scalar(out, metrics.fUnderlinePosition); fprintf(out, "\n    };\n");
+    fprintf(out, "    return metrics;\n");
+    fprintf(out, "}\n\n}\n");
+    fclose(out);
+    return 0;
+}
+
+#if !defined SK_BUILD_FOR_IOS
+int main(int argc, char * const argv[]) {
+    return tool_main(argc, (char**) argv);
+}
+#endif